Large non-Gaussianity in non-minimal inflation
arXiv:1105.0073 · doi:10.1088/1475-7516/2011/11/040
Abstract
We consider a simple inflation model with a complex scalar field coupled to gravity non-minimally. Both the modulus and the angular directions of the complex scalar are slowly rolling, leading to two-field inflation. The modulus direction becomes flat due to the non-minimal coupling, and the angular direction becomes a pseudo-Goldstone boson from a small breaking of the global U(1) symmetry. We show that large non-Gaussianity can be produced during slow-roll inflation under a reasonable assumption on the initial condition of the angular direction. This scenario may be realized in particle physics models such as the Standard Model with two Higgs doublets.
(v1) 14 pages, 2 figures, 1 table; (v2) 15 pages, discussions and references added, to appear in Journal of Cosmology and Astroparticle Physics
References in corpus (10)
- The Standard Model Higgs boson as the inflaton
- Higgs inflation: consistency and generalisations
- Power-counting and the Validity of the Classical Approximation During Inflation
- On Inflation with Non-minimal Coupling
- Unitarizing Higgs Inflation
- A Unitarity-Conserving Higgs Inflation Model
- Evolution of fNL to the adiabatic limit
- Conformal invariance of curvature perturbation
- Codimension-2 brane inflation
- Towards a warped inflationary brane scanning
Cited by in corpus (14)
- Primordial Bispectrum from Multifield Inflation with Nonminimal Couplings
- Primordial Black Holes from Multifield Inflation with Nonminimal Couplings
- Conformal invariance of curvature perturbation
- Inflation and dark matter in two Higgs doublet models
- Planck Constraints and Gravitational Wave Forecasts for Primordial Black Hole Dark Matter Seeded by Multifield Inflation
- Isocurvature Perturbations and Non-Gaussianity of Gravitationally Produced Nonthermal Dark Matter
- Elementary Theorems Regarding Blue Isocurvature Perturbations
- Testing supersymmetric Higgs inflation with non-Gaussianity
- Fermionic Isocurvature Perturbations
- Quadratic Isocurvature Cross-Correlation, Ward Identity, and Dark Matter
- Running of scalar spectral index in multi-field inflation
- Generically large nongaussianity in small multifield inflation
- Conformal Standard Model and Inflation
- About the isocurvature tension between axion and high scale inflationary models